Provided is an active filter circuit connected to a power-receiving terminal of a power line for an alternating-current power supplied to a power converter device from an alternating-current power grid or a direct-current power source interconnected with the alternating-current power grid, or for a direct-current power supplied from the direct-current power source for reducing a harmonic component of a conduction noise propagating to the power line and outputting the reduced harmonic; and a controller for monitoring a variation in the state of an input power entering a power source module for generating drive power for an active element constituting the active filter circuit, or a variation in the state of the drive power supplied from the power source module, and diagnosing an abnormality of a circuit operation for a circuit including the active element of the active filter circuit therein.
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2. The noise filter according to claim 1, wherein when the controller diagnoses that the abnormality has occurred in the circuit operation of the circuit including the active element of the active filter circuit therein on the basis of the variation in the state of the drive power, the controller suspends an operation of the power converter device.
This invention relates to noise filters, specifically active noise filters used in power converter devices to suppress noise in electrical circuits. The problem addressed is ensuring safe operation when an abnormality occurs in the circuit containing the active filter's components, particularly the active elements. The invention provides a noise filter with a controller that monitors the drive power state of the active filter circuit. If the controller detects an abnormality in the circuit operation based on variations in the drive power, it suspends the operation of the power converter device to prevent potential damage or unsafe conditions. The active filter circuit includes at least one active element, such as a transistor or other semiconductor device, which generates a compensation signal to cancel noise in the circuit. The controller continuously evaluates the drive power state to identify anomalies, such as excessive current, voltage fluctuations, or other irregularities, and takes corrective action by halting the power converter's operation when necessary. This ensures system stability and safety by preventing the propagation of faults through the active filter circuit. The invention is particularly useful in power electronics applications where noise suppression is critical, and operational reliability is paramount.
3. The noise filter according to claim 1, wherein when the controller diagnoses that the circuit operation of the circuit including the active element of the active filter circuit therein is normal on the basis of the variation in the state of the drive power, the controller continues an operation of the power converter device.
This invention relates to noise filtering in power converter devices, specifically addressing the challenge of ensuring reliable operation when diagnosing circuit health. The system includes an active filter circuit with an active element that processes drive power to reduce noise in the power converter device. A controller monitors the circuit operation by analyzing variations in the drive power state. If the controller determines that the circuit, including the active element, is functioning normally, the power converter device continues operating without interruption. This ensures stable noise suppression while maintaining system reliability. The active filter circuit dynamically adjusts to maintain performance, and the controller's diagnostic function prevents unnecessary shutdowns by confirming circuit integrity before allowing continued operation. The invention improves noise filtering efficiency and system uptime by integrating real-time monitoring and adaptive control.
4. The noise filter according to claim 1, wherein the controller diagnoses the abnormality in the circuit operation of the circuit including the active element of the active filter circuit therein on the basis of the first current or the second current, and the third current.
This invention relates to a noise filter system designed to suppress noise in electrical circuits, particularly focusing on diagnosing abnormalities in circuit operations. The system includes an active filter circuit with an active element, such as a transistor or amplifier, that processes input signals to reduce noise. The filter circuit generates a first current and a second current, which are used to adjust the filter's characteristics dynamically. Additionally, a third current is generated to monitor the circuit's operational state. A controller within the system analyzes these currents to detect and diagnose abnormalities in the circuit's operation, ensuring reliable noise suppression. The controller compares the first, second, and third currents to identify deviations that indicate potential faults, such as component degradation or malfunction. This diagnostic capability enhances the filter's robustness by allowing early detection of issues before they affect performance. The system is particularly useful in applications requiring high precision and stability, such as communication systems, medical devices, and industrial control systems. By continuously monitoring and adjusting the filter's operation, the invention ensures consistent noise suppression while maintaining circuit integrity.
5. The noise filter according to claim 1, wherein the controller diagnoses that the circuit operation of the circuit including the active element of the active filter circuit therein is normal when the first current or the second current is at or above a first threshold and is at or below a second threshold that is greater than the first threshold.
This invention relates to noise filtering in electronic circuits, specifically an active filter circuit with diagnostic capabilities. The active filter circuit includes an active element that processes input signals to reduce noise, and a controller that monitors the circuit's operation. The controller measures two currents associated with the active element: a first current and a second current. To diagnose the circuit's operational status, the controller evaluates whether these currents fall within a predefined range. If either current is at or above a first threshold and at or below a second, higher threshold, the controller determines that the circuit is functioning normally. This diagnostic feature ensures reliable noise filtering by confirming that the active element operates within safe and effective parameters. The invention addresses the need for self-monitoring in active filter circuits to prevent malfunctions and maintain signal integrity in electronic systems. The diagnostic process involves continuous or periodic current measurements to detect deviations from expected values, allowing for early fault detection and system maintenance. The active filter circuit may be part of a larger electronic system where noise reduction is critical, such as in communication devices, measurement instruments, or power electronics.
6. The noise filter according to claim 1, wherein the controller diagnoses that the circuit operation of the circuit including the active element of the active filter circuit therein is normal when the third current is at or above a third first threshold and is at or below a second threshold that is greater than the first threshold.
This invention relates to noise filtering in electronic circuits, specifically an active filter circuit with diagnostic capabilities. The active filter circuit includes an active element that processes input signals to reduce noise. The controller monitors the circuit's operation by measuring a third current, which is a current associated with the active element. The controller diagnoses the circuit as operating normally when this third current is within a defined range, specifically at or above a first threshold and at or below a second threshold, where the second threshold is higher than the first. This diagnostic function ensures that the active filter circuit operates correctly, preventing degraded performance or failure. The active filter circuit may include additional components such as passive elements or other active elements to enhance filtering performance. The diagnostic mechanism helps maintain system reliability by detecting deviations in the third current that could indicate faults or performance issues. This approach is particularly useful in applications where signal integrity is critical, such as in communication systems, medical devices, or industrial control systems. The invention improves upon prior art by providing a real-time diagnostic method that relies on current monitoring to assess circuit health, reducing the need for external testing or manual inspection.
7. The noise filter according to claim 1, further comprising a passive filter for the power line which is supplied the alternating-current power supplied to a the power converter device from the alternating-current power grid or the direct-current power source interconnected with the alternating-current power grid, or is supplied from the direct-current power source on the power converter device side, for reducing common mode noise propagating to the power line.
This invention relates to noise filtering in power converter devices, particularly for reducing common mode noise in power lines. The system includes a power converter device that converts alternating-current (AC) power from an AC power grid or a direct-current (DC) power source interconnected with the grid into DC power for a load. The invention addresses the problem of common mode noise propagating through the power line, which can interfere with other electronic systems. The noise filter includes a passive filter specifically designed for the power line. This passive filter is supplied with the AC power that is either drawn from the AC power grid or the interconnected DC power source, or it is supplied from a DC power source on the power converter device side. The passive filter reduces common mode noise, preventing it from propagating back into the power line and affecting other connected systems. The filter ensures that noise generated during power conversion does not disrupt the power grid or other devices sharing the same power line. The passive filter is integrated into the power converter device and operates without requiring active components, relying instead on passive elements like capacitors, inductors, or resistors to attenuate noise. This design simplifies implementation while effectively mitigating noise interference. The invention is particularly useful in applications where power quality and electromagnetic compatibility are critical, such as in industrial, medical, or telecommunications equipment.
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December 16, 2020
May 14, 2024
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